Finite Element Analysis of Composite Laminates

The first chapter presents an overview of the text. Chapter 2 is devoted to the introduction of the definitions and terminology used in composite materials and structures.

Finite Element Analysis of Composite Laminates

Composite materials are increasingly used in aerospace, underwater, and automotive structures. To take advantage of the full potential of composite materials, structural analysts and designers must have accurate mathematical models and design methods at their disposal. The objective of this monograph is to present the laminated plate theories and their finite element models to study the deformation, strength and failure of composite structures. Emphasis is placed on engineering aspects, such as the analytical descriptions, effective analysis tools, modeling of physical features, and evaluation of approaches used to formulate and predict the response of composite structures. The first chapter presents an overview of the text. Chapter 2 is devoted to the introduction of the definitions and terminology used in composite materials and structures. Anisotropic constitutive relations and Iaminate plate theories are also reviewed. Finite element models of laminated composite plates are presented in Chapter 3. Numerical evaluation of element coefficient matrices, post-computation of strains and stresses, and sample examples of laminated plates in bending and vibration are discussed. Chapter 4 introduces damage and failure criteria in composite laminates. Finally, Chapter 5 is dedicated to case studies involving various aspects and types of composite structures. Joints, cutouts, woven composites, environmental effects, postbuckling response and failure of composite laminates are discussed by considering specific examples.

Finite Element Analysis of Composite Laminates

This is of the fundamental importance to develop tools that allow the designer to obtain the optimized design considering the structural requirements, functional characteristics and restrictions imposed by the production process.

Finite Element Analysis of Composite Laminates

The composite materials are well known by their excellent combination of high structural stiffness and low weight. This is of the fundamental importance to develop tools that allow the designer to obtain the optimized design considering the structural requirements, functional characteristics and restrictions imposed by the production process. In this work, taking into considerations the above limitations the dynamic behavior of beams and plate manufactured from fiber reinforced composite materials are considered. Modal analysis is carried out with the help of commercial finite element code ANSYS to determine the influence of fiber orientation as well as the stacking sequence on the natural frequencies and maximum central deflection in case of uniform loading over the plate. The behavior of laminated composite plate under pressure loading was studied by using ANSYS . The effect of fiber orientation, number of plies, and stiffness ratio on the displacement of symmetric and anti symmetric laminated composite plates subjected to uniform pressure loads are studied in this work.

Practical Analysis of Composite Laminates

This comprehensive text can be used for a graduate course in mechanical engineering, and as a valuable reference for professionals in the field.

Practical Analysis of Composite Laminates

Composite materials are increasingly used in aerospace, underwater, and automotive structures. They provide unique advantages over their metallic counterparts, but also create complex challenges to analysts and designers. Practical Analysis of Composite Laminates presents a summary of the equations governing composite laminates and provides practical methods for analyzing most common types of composite structural elements. Experimental results for several types of structures are included, and theoretical and experimental correlations are discussed. The last chapter is devoted to practical analysis using Designing Advanced Composites (DAC), a PC-based software on the subject. This comprehensive text can be used for a graduate course in mechanical engineering, and as a valuable reference for professionals in the field.

FINITE ELEMENT ANALYSIS OF COMPOSITE LAMINATES SUBJECTED TO AXIAL TRANSVERSE LOADING

This thesis focuses on the investigation of behavior of thick and moderately thick laminates under transverse and horizontal loading for different boundary conditions and configurations.

FINITE ELEMENT ANALYSIS OF COMPOSITE LAMINATES SUBJECTED TO AXIAL   TRANSVERSE LOADING

This thesis focuses on the investigation of behavior of thick and moderately thick laminates under transverse and horizontal loading for different boundary conditions and configurations. An efficient finite element solution is proposed for analyzing composite laminates. Based on a combination of composite theory and 3-D Elasticity Theory, a 3-D finite element program is developed in MATLAB for calculating the stresses, strains and deformations of composite laminates under transverse and/or horizontal loading for different boundary conditions. The applicability of the formulation to analysis of laminated rubber bearings is also examined in this study. Since it is very important to calculate the correct stress state when developing models for composite behavior, the 3-D Elasticity Theory is used in this research. Numerical results are presented for various problems with different lamination schemes, loading and boundary conditions. In order to verify the analysis and the numerical calculations, numerical solutions obtained in this study are compared with available closed form solutions in the literature, experiment results and a commercial finite element program, namely ANSYS. The results obtained using the present finite element is found to be in acceptable and good agreement with the closed form solutions in the literature for thick and moderately thick rectangular and square plates.

Hybrid Finite Element Method for Stress Analysis of Laminated Composites

This book has one single purpose: to present the development of the partial hybrid finite element method for the stress analysis of laminated composite structures.

Hybrid Finite Element Method for Stress Analysis of Laminated Composites

This book has one single purpose: to present the development of the partial hybrid finite element method for the stress analysis of laminated composite structures. The reason for this presentation is because the authors believe that partial hybrid finite element method is more efficient that the displacement based finite element method for the stress analysis oflaminated composites. In fact, the examples in chapter 5 of this book show that the partial hybrid finite element method is about 5 times more efficient than the displacement based finite element method. Since there is a great need for accurate and efficient calculation of interlaminar stresses for the design using composites, the partial hybrid finite method does provide one possible solution. Hybrid finite method has been in existence since 1964 and a significant amount of work has been done on the topic. However, the authors are not aware of any systematic piece of literature that gives a detailed presentation of the method. Chapters of the displacement finite element method and the evolution 1 and 2 present a sununary of the hybrid finite element method. Hopefully, these two chapters can provide the readers with an appreciation for the difference between the displacement finite element method and the hybrid finite element. It also should prepare the readers for the introduction of partial hybrid finite element method presented in chapter 3.

Three dimensional Elastoplastic Finite Element Analysis of Laminated Composites

A three-dimensional elastoplastic analysis of generally orthotropic composite laminates is developed, together with a finite element computer code NCLAP (nonlinear Composite Laminate Analysis Program) for its implementation.

Three dimensional Elastoplastic Finite Element Analysis of Laminated Composites

A three-dimensional elastoplastic analysis of generally orthotropic composite laminates is developed, together with a finite element computer code NCLAP (nonlinear Composite Laminate Analysis Program) for its implementation. The analysis is capable of handling any laminated composite subjected to triaxial mechanical and/or hygrothermal loading conditions. The laminates can consist of any number of orthotropic material piles, of any orientations. Elastoplastic material behavior is included by means of the tangent modulus method. The onset of plastic deformation is determined by a failure surface in three-dimensional space, and is likewise dependent on temperature and moisture. The three-dimensional finite element analysis is based on a displacement formulation employing linear isoparametric elements. Large aspect ratios, typical of laminae finite element representations, are handled by the use of reduced integration techniques. Material properties are input to NCLAP as coefficients of second order polynomials describing the elastoplastic response, and the dependence on temperature and moisture content. Incremental mechanical loadings can be applied as nodal forces and/or prescribed displacements. Hygrothermal loadings are applied as constant overall changes, or as spatial distributions, of temperature and moisture content. Computer Program NCLAP has been developed in modular form, which will permit it to be easily modified to accommodate future extensions of the analysis. (Author).

Damage Modeling of Composite Structures

Damage Modeling of Composite Structures: Strength, Fracture, and Finite Element Analysis provides readers with a fundamental overview of the mechanics of composite materials, along with an outline of an array of modeling and numerical ...

Damage Modeling of Composite Structures

Damage Modeling of Composite Structures: Strength, Fracture, and Finite Element Analysis provides readers with a fundamental overview of the mechanics of composite materials, along with an outline of an array of modeling and numerical techniques used to analyze damage, failure mechanisms and safety tolerance. Strength prediction and finite element analysis of laminated composite structures are both covered, as are modeling techniques for delaminated composites under compression and shear. Viscoelastic cohesive/friction coupled model and finite element analysis for delamination analysis of composites under shear and for laminates under low-velocity impact are all covered at length. A concluding chapter discusses multiscale damage models and finite element analysis of composite structures. Integrates intralaminar damage and interlaminar delamination under different load patterns, covering intralaminar damage constitutive models, failure criteria, damage evolution laws, and virtual crack closure techniques Discusses numerical techniques for progressive failure analysis and modeling, as well as numerical convergence and mesh sensitivity, thus allowing for more accurate modeling Features models and methods that can be seamlessly extended to analyze failure mechanisms and safety tolerance of composites under more complex loads, and in more extreme environments Demonstrates applications of damage models and numerical methods

Finite Element Analysis of Composite Materials

By layering detailed theoretical and conceptual discussions with fully developed examples, this text supplies the missing link between theory and implementation.

Finite Element Analysis of Composite Materials

Designing structures using composite materials poses unique challenges due especially to the need for concurrent design of both material and structure. Students are faced with two options: textbooks that teach the theory of advanced mechanics of composites, but lack computational examples of advanced analysis; and books on finite element analysis that may or may not demonstrate very limited applications to composites. But now there is third option that makes the other two obsolete: Ever J. Barbero's Finite Element Analysis of Composite Materials. By layering detailed theoretical and conceptual discussions with fully developed examples, this text supplies the missing link between theory and implementation. In-depth discussions cover all of the major aspects of advanced analysis, including three-dimensional effects, viscoelasticity, edge effects, elastic instability, damage, and delamination. More than 50 complete examples using mainly ANSYSTM, but also including some use of MATLAB®, demonstrate how to use the concepts to formulate and execute finite element analyses and how to interpret the results in engineering terms. Additionally, the source code for each example is available for download online. Cementing applied computational and analytical experience to a firm foundation of basic concepts and theory, Finite Element Analysis of Composite Materials offers a modern, practical, and versatile classroom tool for today's engineering classroom.

Failure Analysis of Composite Laminates with a Hole by Using Finite Element Method

Predicting the strength of a given laminate has been extensively studied.

Failure Analysis of Composite Laminates with a Hole by Using Finite Element Method

Predicting the strength of a given laminate has been extensively studied. There have been several fracture models proposed but still the immense tests of composite laminates are still needed. Different material systems or lay-ups exhibit different failure modes and failure mechanisms. This thesis focuses in investigation of the failure mechanism of the [+/-theta/0 2]s and [02/+/-theta]s laminates with a hole. ANSYS finite element models with and without a crack in vicinity of hole were developed to investigate the effect of the stress distribution due to the presence of the angle ply crack. The stress concentrations were obtained. It is found that (1) The stress concentrations increases as d/w increases for a given theta in [+/-theta/02] s and [02/+/-theta]s laminates; (2) For a given d/w ratio, the stress concentrations increases as ply orientation, theta increases; and (3) The high stress concentrations on 0° ply occurs at the location where the theta-ply crack intercepts at the line perpendicular to the 0° ply. Based upon the understanding the failure mechanism, a simple expression to estimate the strength of laminates with a hole is established. A strength model based upon the 0° ply load carrying capability is proposed. Prediction is a good agreement with the experimental results.

Finite Element Analysis of Edge Effects in Angle Ply Composite Laminates

A three dimensional finite element modeling and analysis technique has been developed and used in the evaluation of edge stresses in angle-ply composite laminates.

Finite Element Analysis of Edge Effects in Angle Ply Composite Laminates

A three-dimensional finite-element modelling and analysis technique is developed and used in the evaluation of edge stresses in angle- ply composite laminates. Excellent results are obtained for the initial application to a four-ply + or -45 degree laminate in tension, and the method is potentially applicable to holes, notches and other boundaries of arbitrary geometry. (Author-PL).

Hybrid Finite Element Analysis of Free Edge Effect in Symmetric Composite Laminates

In their study, finite difference technique was applied to a symmetric finite-width composite laminate subjected to uniform uniaxial strain. Subsequently other techniques were used to solve similar problems.

Hybrid Finite Element Analysis of Free Edge Effect in Symmetric Composite Laminates

The analytical study of the nature of interlaminar stresses near stress free edges has been the subject of substantial research interest. Such studies are significant because the high interlaminar stresses or stress singularities near stress-free edges may cause delamination failure as shown by experimental investigations. Also the accurate prediction of these stresses may be useful in the design of test specimens for investigation of laminate strength. One of the first analytical studies on interlaminar stresses near stress-free edges was published by Pipes and Pagano. In their study, finite difference technique was applied to a symmetric finite-width composite laminate subjected to uniform uniaxial strain. Subsequently other techniques were used to solve similar problems.

Finite Element Analysis of Composite Materials using AbaqusTM

Effects of layup angle and ply thickness on matrix crack interaction in contiguous plies of composite laminates. ... [139] [140] [141] [142] [143] [144] [145] [146] [147] [148] 402 Finite Element Analysis of Composite Materials.

Finite Element Analysis of Composite Materials using AbaqusTM

Developed from the author's graduate-level course on advanced mechanics of composite materials, Finite Element Analysis of Composite Materials with Abaqus shows how powerful finite element tools address practical problems in the structural analysis of composites. Unlike other texts, this one takes the theory to a hands-on level by actually solving

Analysis of Composite Laminates and Fibre Composite Repair Schemes

In recent years several advanced finite element methods have been developed for the analysis of laminated composites; these take into account the membrane, bending, and interlaminar stresses.

Analysis of Composite Laminates and Fibre Composite Repair Schemes

In recent years several advanced finite element methods have been developed for the analysis of laminated composites; these take into account the membrane, bending, and interlaminar stresses. Similarly, finite element methods have also been developed for the analysis of structures repaired with a bonded overlay of fibre composite material. The present paper discusses these methods and indicates how the finite element method developed for the analysis of structural repairs is connected to those methods specifically developed for the analysis of composite laminates.